Ion channels are pore-forming membrane proteins whose functions include establishing a resting membrane potential, shaping action potentials and other electrical signals by gating the flow of ions across the cell membrane, controlling the flow of ions across secretory and epithelial cells, and regulating cell volume. Ion channels are present in th...
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http://en.wikipedia.org/wiki/Ion_channel
An integral membrane protein that provides for the regulated transport of a specific ions across a membrane.
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http://www.combichemistry.com/glossary_g.html
An integral membrane protein that provides for the regulated transport of a specific ions across a membrane.
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http://www.combichemistry.com/medical-chemistry-glossary.html
<cell biology> A transmembrane pore that presents a hydrophilic channel for ions to cross a lipid bilayer down their electrochemical gradients. ... Some degree of ion specificity is usually observed and typically a million ions per second may flow. Channels may be permanently open, like the potassium leak channel or they may be voltage gated,...
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http://www.encyclo.co.uk/local/20973
a cell membrane protein with an ion-specific transmembrane pore, through which which ions and small molecules pass into or out of a cell by diffusion downward along their electrochemical gradient. Called also protein c.
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http://www.encyclo.co.uk/local/21001
A transmembrane pore that presents a hydrophilic channel for ions to cross a lipid bilayer down their electrochemical gradients. Some degree of ion specificity is usually observed, and typically a million ions per second may flow. Channels may be permanently open, like the potassium leak channel; or they may be voltage-gated, like the sodium channel; or ligand-gated like the acetylcholine receptor.
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http://www.encyclo.co.uk/visitor-contributions.php
Type: Term Definitions: 1. a specific macromolecular protein pathway, with an aqueous 'pore,' which traverses the lipid bilayer of a cell's plasma membrane and maintains or modulates the electrical potential across this barrier by allowing the controlled influx or exit of small inorganic ions such as Na+, K+, Cl−, and Ca2+. It plays an import...
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http://www.medilexicon.com/medicaldictionary.php?t=16513
Ion channel: A protein that acts as a pore in a cell membrane and permits the selective passage of ions (such as potassium ions, sodium ions, and calcium ions), by means of which electrical current passes in and out of the cell. Ion channels also serve many other critically important functions including chemical signalling, transcellular transport,...
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http://www.medterms.com/script/main/art.asp?articlekey=24584
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